On the basis of introduction of commonly used detection methods for hermetization, the demerits of differential pressure (D/P) measure are analyzed.
在介绍目前常用的气密性检测方法的基础上，分析了普通差压法的缺陷。
Based on P-well CMOS processes, a novel differential CMOS current conveyor is presented.
基于P阱CMOS工艺提出了一种新的差动输入电流传送器。
Results The differential diagnostic efficiency with MRI were significantly better than those with US and CT ( P<0.05) .
结果MRI对胆道梗阻性病变良恶性鉴别诊断的效能优于US和CT诊断（P<0.05）。
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